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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (45,130) $ (155,723)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 422,276 375,545
Dry holes and abandonments 562 28
Deferred income tax benefit (8,100) (90,684)
Stock-based compensation expense 19,272 22,170
Net gain on asset disposals (17,472) (15,367)
Amortization of debt discount and issuance costs 387 173
Changes in operating assets and liabilities:    
Accounts receivable (22,363) (135,542)
Income taxes receivable (22) (1,141)
Inventory and other assets (25,277) (29,186)
Accounts payable (23,432) 58,372
Accrued expenses (542) (13,002)
Other liabilities 76 (258)
Net cash provided by operating activities 300,235 15,385
Cash flows from investing activities:    
Acquisitions, net of cash acquired (3,800) (434,194)
Purchases of property and equipment (317,783) (186,790)
Proceeds from disposal of assets 21,005 34,997
Collection of note receivable 23,760  
Net cash used in investing activities (276,818) (585,987)
Cash flows from financing activities:    
Proceeds of equity offering   471,570
Purchases of treasury stock (59,879) (3,727)
Proceeds from exercise of options 485  
Dividends paid (13,275) (7,595)
Debt issuance costs (4,333)  
Proceeds from long-term debt 521,194  
Proceeds from borrowings under revolving credit facility 79,000 161,000
Repayment of borrowings under revolving credit facility (347,000) (46,000)
Net cash provided by financing activities 176,192 575,248
Effect of foreign exchange rate changes on cash (529) 334
Net increase in cash and cash equivalents 199,080 4,980
Cash and cash equivalents at beginning of period 42,828 35,152
Cash and cash equivalents at end of period 241,908 40,132
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $722 in 2018 and $409 in 2017 (15,573) (16,640)
Income taxes 21 967
Non-cash investing and financing activities:    
Receivable from property and equipment insurance 15,000  
Net increase in payables for purchases of property and equipment 75,032 33,938
Issuance of common stock for business acquisitions   1,039,396
Net (increase) decrease in deposits on equipment purchases $ (5,419) $ 3,133